Mostly correct, but be under no illusion, it will knacker your health. You are working irregular hours, with no fixed sleep pattern. I did 11 years, which has given me a first class pension, but also gave me two spells in hospital, (Private of course!) and I finally gave up and finished with another 5yrs of SLF at about half the salery, but felt much better for it. Certainly worth doing for about 10 years.